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tracing/events: make struct trace_entry->type to be int type 

struct trace_entry->type is unsigned char, while trace event's id is
int type, thus for a event with id >= 256, it's entry->type is cast
to (id % 256), and then we can't see the trace output of this event.

 # insmod trace-events-sample.ko
 # echo foo_bar > /mnt/tracing/set_event
 # cat /debug/tracing/events/trace-events-sample/foo_bar/id
 256
 # cat /mnt/tracing/trace_pipe
           <...>-3548  [001]   215.091142: Unknown type 0
           <...>-3548  [001]   216.089207: Unknown type 0
           <...>-3548  [001]   217.087271: Unknown type 0
           <...>-3548  [001]   218.085332: Unknown type 0

[ Impact: fix output for trace events with id >= 256 ]

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <49EEDB0E.5070207@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-04-22 16:53:34 +08:00 committed by Ingo Molnar
parent 3554228d42
commit 7a4f453b6d
5 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/ftrace_event.h
View File

@ -16,7 +16,7 @@ struct dentry;
* bash-15816 [01] 235.197585: idle_cpu <- irq_enter
*/
struct trace_entry {
unsigned char type;
int type;
unsigned char flags;
unsigned char preempt_count;
int pid;
@ -73,7 +73,7 @@ enum print_line_t {
struct ring_buffer_event *
trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,
trace_current_buffer_lock_reserve(int type, unsigned long len,
unsigned long flags, int pc);
void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
unsigned long flags, int pc);

2
include/trace/ftrace.h
View File

@ -198,7 +198,7 @@ ftrace_define_fields_##call(void) \
struct ftrace_event_call *event_call = &event_##call; \
int ret; \
\
__common_field(unsigned char, type); \
__common_field(int, type); \
__common_field(unsigned char, flags); \
__common_field(unsigned char, preempt_count); \
__common_field(int, pid); \

4
kernel/trace/trace.c
View File

@ -838,7 +838,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
}
struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr,
unsigned char type,
int type,
unsigned long len,
unsigned long flags, int pc)
{
@ -881,7 +881,7 @@ void trace_buffer_unlock_commit(struct trace_array *tr,
}
struct ring_buffer_event *
trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,
trace_current_buffer_lock_reserve(int type, unsigned long len,
unsigned long flags, int pc)
{
return trace_buffer_lock_reserve(&global_trace,

2
kernel/trace/trace.h
View File

@ -422,7 +422,7 @@ void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
struct ring_buffer_event;
struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr,
unsigned char type,
int type,
unsigned long len,
unsigned long flags,
int pc);

2
kernel/trace/trace_events.c
View File

@ -398,7 +398,7 @@ static int trace_write_header(struct trace_seq *s)
"\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
"\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
"\n",
FIELD(unsigned char, type),
FIELD(int, type),
FIELD(unsigned char, flags),
FIELD(unsigned char, preempt_count),
FIELD(int, pid),